JPH0566090A - Vacuum furnace - Google Patents

Abstract

PURPOSE:To facilitate the lubrication for a bearing of a fan motor and extend its life by introducing a refrigerant gas in a vacuum furnace which cools processed articles. CONSTITUTION:A vacuum furnace is designed to charge processed articles into a pressure resistance chamber 1, heat the articles in a vacuum condition, introduce a refrigerant gas into the chamber 1 and circulate the gas through the chamber by rotating a fan 7 so as to cools the processed articles. A fan motor 8, which is provided with a grease supply type bearing, is installed to a pressure resistance motor chamber 14 communicating with the chamber 1. Bearings 15 are connected with oil supply pipelines 16 and oil discharge pipelines 17 so as to supply the grease to or discharge the grease from the bearings from the outside of the motor chamber 14 where the pipelines 16 and 17 are installed in such a fashion that they may penetrate the wall of the motor chamber by way to a sealing component 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum furnace for cooling a processed product by introducing a refrigerant gas, and more particularly to a structure for extending a bearing life of a fan motor for circulating the refrigerant gas. .

[0002]

2. Description of the Related Art In a vacuum furnace, a processed product is generally loaded into a pressure-resistant chamber, air in the chamber is discharged to the outside, and the external processed product is heated to a desired high temperature in a vacuum state. N ₂ gas or the like is introduced as a refrigerant gas into the inside of the chamber, and the refrigerant gas is circulated by the rotation of a fan in the chamber so that the processed product can be rapidly cooled.

By the way, since the fan motor for rotating the upper fan is arranged in the pressure-resistant motor chamber and it is difficult to lubricate its bearings from the outside, it is conventionally difficult to lubricate the grease. I was using formula bearings.

[0004]

However, the oil-free type bearing has a drawback that it is less durable and has a shorter service life than the oil-type type, so it is preferable to use the oil-type type bearing, but the fan motor is installed in a pressure-resistant motor chamber. Therefore, in the conventional structure, there is a problem that the motor chamber wall must be removed to refuel, which requires a great deal of work and requires attention to maintain the airtight sealing property, which imposes a burden on the maintenance on the user side.

[0005]

DISCLOSURE OF THE INVENTION The vacuum furnace of the present invention is intended to solve the above-mentioned problems, in which a processed product is loaded into a pressure resistant chamber and heated in a vacuum state, and a refrigerant gas is introduced into the chamber. In a vacuum furnace that cools the processed product by introducing the above and circulating the refrigerant gas by rotation of a fan, a fan motor equipped with a grease replenishing type bearing is installed in a pressure resistant motor chamber communicating with the chamber. The bearing is provided with means for supplying and discharging grease from outside the motor chamber.

Further, the present invention is characterized in that, in the above-mentioned vacuum furnace, a port that can be opened and closed in an airtight manner is provided in a part of the motor chamber, and an oil supply pipe and an oil discharge pipe connected to the bearing are exposed to the port. is there.

Further, the present invention is characterized in that, in the above-mentioned vacuum furnace, an oil supply pipe and an oil discharge pipe connected to the bearing are pierced through the motor chamber wall through a seal member to the outside of the motor chamber.

Further, the present invention is characterized in that, in the above-mentioned vacuum furnace, an automatic oil supply device which operates periodically is provided at the tip of an oil supply pipe provided outside the motor chamber.

[0009]

The grease supply / drain oil to / from the bearing of the fan motor can be easily performed from the outside, facilitating maintenance, and extending its life.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of this vacuum furnace. In FIG. 1, reference numeral 1 is a chamber made of a pressure-resistant cylindrical shell wall, and 2 is an opening / closing door provided in a front end opening of the chamber 1 so as to be airtightly closed. 3 is a processing chamber partitioned by a heat insulating wall provided in the chamber 1, 4 is a heater provided on the inner wall surface of the processing chamber 3, 5 is a processed product installed in the processing chamber 3, and 6 is A heat exchanger for cooling the refrigerant gas is provided in the inner portion of the chamber 1 adjacent to the processing chamber 3.

The fan 7 is provided behind the heat exchanger 6 so as to be fixed to the rotary shaft 9 of the fan motor 8. The flange portion 11 of the fan motor 8 is fixed to the inner edge of the opening of the rear end wall of the chamber 1 by a bolt and nut 10. Then, a pressure-resistant bottomed cylindrical wall 13 is fixed to the back surface of the chamber 1 by a bolt / nut 12, and the fan motor 8 is housed in a motor chamber 14 formed by the bottomed cylindrical wall 13.
The motor chamber 14 and the chamber 1 are in communication with each other, and when the chamber 1 is in a vacuum state, the pressure inside the motor chamber 14 is also reduced.

The fan motor 8 has a rotating shaft 9 supported by grease-replenishing bearings 15, 15, and the bearings 15, 15 have oil supply pipes 16, 16 extending upward and drain oil pipes 17, extending downward. Take over 17.

A port 18 is provided on the upper wall of the motor chamber 14.
And the port 18 is covered with a cover plate 19 so that the port 18 can be opened and closed in an airtight manner, and the oil supply pipes 16 and 16 are exposed to the port 18. Further, a port 20 is opened in the lower wall portion of the motor chamber 14, and a valve 21 is provided in the port 20 so that the port 20 can be opened and closed airtightly, and the oil drain pipes 17, 17 are exposed to the port 20.

For this reason, as soon as the cover plate 19 is removed, the oil supply pipes 16, 16 are opened inside thereof, so that the nozzle end of the oil supply device (not shown) is attached to the oil supply pipes 16, 16. The grease can be easily supplied to the bearings 15 and 15.

Further, the oil drained from the bearings 15 and 15 passes through the oil drain pipes 17 and 17 and is dripped and collected in the oil drain receiver 28, so that it can be drained to the outside by appropriately opening the valve 21.

On the other hand, in the embodiment shown in FIG. 2, the oil supply pipes 16 and 16 and the oil discharge pipes 17 and 17 connected to the bearings 15 and 15 of the fan motor 8 are provided outside through the wall of the motor chamber 14. The airtightness in the motor chamber 14 is maintained by providing the seal member 22 at the portion penetrating the chamber wall. In this embodiment, an automatic oil supply device comprising an oil supply pump 23, a grease tank 24 and a timer 25 is connected to the oil supply pipes 16 and 16, and the oil supply pump 23 is operated by the timer 25, for example, once a month. In this way, the grease in the grease tank 24 is regularly supplied to the bearings 15 and 15 via the oil supply pump 23 and the oil supply pipes 16 and 16. Reference numeral 26 is an oil drain receiver for the oil drain pipes 17, 17.

Further, the vacuum furnace shown in FIG.
The duct 27 is extended by the top wall and the bottom wall, the fan 7 is provided in the middle of the duct 27, and the fan motor 8 for rotating the fan 7 is provided in the motor chamber 14.
Even in the vacuum furnace in which the fan 7 is provided outside the chamber 1 as described above, maintenance can be easily performed by connecting the oil supply pipes 16, 16 and the oil discharge pipes 17, 17 for oil supply / drainage of the bearings 15, 15 of the fan 7. Become.

[0018]

As described above, according to the vacuum furnace of the present invention, it is possible to easily supply and discharge grease to the bearings of the fan motor from the outside, which facilitates maintenance and reduces the burden on the user and the durability of the bearings. There is a beneficial effect of improving the sex.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a vacuum furnace of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the vacuum furnace of the present invention.

FIG. 3 is a longitudinal sectional view showing still another embodiment of the vacuum furnace of the present invention.

[Explanation of symbols]

 1 Chamber 7 Fan 8 Fan Motor 14 Motor Chamber 15,15 Bearing 16,16 Oil Supply Pipe 17,17 Oil Discharge Pipe 18 Port 19 Cover Plate 20 Port 21 Valve 22 Sealing Member 23 Oil Pump 24 Grease Tank 25 Timer

Claims (4)

[Claims] 1. A processed product is placed in a pressure-resistant chamber, heated in a vacuum state, a refrigerant gas is introduced into the chamber, and the refrigerant gas is circulated by rotation of a fan, thereby treating the processed product. In a vacuum furnace for cooling, a fan motor having a grease replenishing type bearing is installed in a pressure resistant motor chamber communicating with the chamber, and the bearing is provided with means for supplying and discharging grease from outside the motor chamber. Vacuum furnace characterized by. 2. The vacuum furnace according to claim 1, wherein a port that can be opened and closed in an airtight manner is provided in a part of the motor chamber, and an oil supply pipe and a drain oil pipe connected to the bearing are exposed to the port. 3. The vacuum furnace according to claim 1, wherein an oil supply pipe and an oil discharge pipe connected to the bearing are provided outside the motor chamber by penetrating the motor chamber wall through a seal member. 4. The vacuum furnace according to claim 3, wherein an automatic oil supply device that operates periodically is provided at the tip of an oil supply pipe provided outside the motor chamber.